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IMPORTANT SIZING NOTE - Most plumbing products are measured using BSP thread dimensions which measure 1/4 inch larger than that stated, therefore this 3/4 Inch BSP thread actually measures 1 Inch in diameter. If your thread measures 3/4 Inch in diameter then you require the 1/2 Inch version of this product This listing is for a Pack of 1 FOR EXAMPLE THIS 3/4 INCH BSP THREAD ACTUALLY MEASURES APPROXIMATELY 1 INCH IN DIAMETER Installed at the lowest point of a heating or water loop, it provides a dedicated, controlled outlet to completely drain down pipework, radiators, or boilers without splashing or causing water damage to surrounding floors. Manufactured to UK & European plumbing standards